Andrus Adamchik closed CAY-949.
-------------------------------
Resolution: Fixed
This was closed for M3... somehow I forgot to close the jira... doing it now
> Factory for lifecycle listeners
> -------------------------------
>
> Key: CAY-949
> URL: https://issues.apache.org/cayenne/browse/CAY-949
> Project: Cayenne
> Issue Type: New Feature
> Components: Cayenne JPA
> Affects Versions: 3.0
> Reporter: Andrus Adamchik
> Assignee: Andrus Adamchik
> Fix For: 3.0
>
>
> So far we've followed the JPA spec in Cayenne classic callbacks/listeners implementation. I am using listeners extensively and till now I used to install them in the code. Now that Modeler supports listeners, I discovered that the default mechanism of listener instantiation (Class.forName("listenerClass").newInstance()) is inadequate when a listener has dependencies on its environment. I guess in the J2EE world the dependencies are obtained via JNDI, but I wanted to use injection as a cleaner approach (and to avoid setting up JNDI).
> So... I wrote an extension point that would allow users to register a factory object for creating the listeners:
> public interface EntityListenerFactory {
> <T> T createListener(Class<T> listenerClass, ObjEntity entity);
> }
> This would support dependency injection (or any other environment specific customization) of the listener objects, as well as using interfaces for the listeners - something JPA does not support. So the same listener configuration may be used with different implementations depending on some app logic.
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